Thickness-dependent structural arrangement in nano-confined imidazolium-based ionic liquid films

2015 ◽  
Vol 17 (6) ◽  
pp. 4152-4159 ◽  
Author(s):  
Michael Rouha ◽  
Peter T. Cummings
Keyword(s):  
Ionic Liquid ◽  
Structural Changes ◽  
Liquid Films ◽  
Adsorbed Film ◽  
Structural Arrangement ◽  
Interfacial Layers

Nano-confined ionic liquid interfacial layers showing lateral and perpendicular structural changes dependent on thickness of adsorbed film.

Study of the structural degradation of steel 15Kh5M upon continuous duty

2020 ◽  
Vol 86 (1) ◽  
pp. 38-43
Author(s):  
Vladimir A. Kim ◽  
Valeriya V. Lysenko ◽  
Anna A. Afanaseva ◽  
Khasan I. Turkmenov
Keyword(s):  
Grain Boundaries ◽  
Structural Changes ◽  
Structural Transformations ◽  
Structural Degradation ◽  
Structural Arrangement ◽  
Dispersed Particles ◽  
Complex Process ◽  
Multifractal Spectra ◽  
Steel 15Kh5m ◽  
Complex Indicators

Structural degradation of the material upon long-term thermal and force impacts is a complex process which includes migration of the grain boundaries, diffusion of the active elements of the external and technological environment, hydrogen embrittlement, aging, grain boundary corrosion and other mechanisms. Application of the fractal and multifractal formalism to the description of microstructures opens up wide opportunities for quantitative assessment of the structural arrangement of the material, clarifies and reveals new aspects of the known mechanisms of structural transformations. Multifractal parameterization allows us to study the processes of structural degradation from the images of microstructures and identify structural changes that are hardly distinguishable visually. Any quantitative structural indicator can be used to calculate the multifractal spectra of the microstructure, but the most preferable is that provides the maximum range of variation in the numerical values of the multifractal components. The results of studying structural degradation of steel 15Kh5M upon continuous duty are presented. It is shown that structural degradation of steel during operation under high temperatures and stresses is accompanied by enlargement of the microstructural objects, broadening of the grain boundaries and allocation of the dispersed particles which are represented as point objects in the images. The processes of structural degradation lead to an increase in the range of changes in the components of the multifractal spectra. High values of complex indicators of structural arrangement indicate to an increase in heterogeneity and randomness at the micro-scale level, but at the same time, to manifestation of the ordered combinations of individual submicrostructures. Those structural transformations adapt the material to external impacts and provide the highest reliability and fracture resistance of the material.

scholarly journals Diffusional Dynamics of Tetraalkylphosphonium Ionic Liquid Films Measured by Fluorescence Correlation Spectroscopy

2019 ◽  
Vol 123 (23) ◽  
pp. 4943-4949 ◽  
Author(s):  
Deyny L. Mendivelso-Pérez ◽  
Muhammad Qamar Farooq ◽  
Kalyan Santra ◽  
Jared L. Anderson ◽  
Jacob W. Petrich ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Fluorescence Correlation Spectroscopy ◽  
Liquid Films ◽  
Correlation Spectroscopy ◽  
Fluorescence Correlation

scholarly journals Co-Poly(ionic liquid) Films via Anion Exchange for the Continuous Tunability of Ion Transport and Wettability

ACS Omega ◽  
2018 ◽  
Vol 3 (11) ◽  
pp. 16158-16164 ◽  
Author(s):  
Ian Njoroge ◽  
Brandon W. Bout ◽  
Maxwell W. Matson ◽  
Paul E. Laibinis ◽  
G. Kane Jennings
Keyword(s):  
Ionic Liquid ◽  
Ion Transport ◽  
Anion Exchange ◽  
Liquid Films ◽  
Poly Ionic Liquid ◽  
Continuous Tunability

Effect of Heat Treatment on the Nano-Tribological Properties of Ionic Liquid Films

2009 ◽  
pp. 505-506
Author(s):  
Wenjie Zhao ◽  
Deming Huang ◽  
Jibing Pu ◽  
Mingwu Baia
Keyword(s):  
Heat Treatment ◽  
Ionic Liquid ◽  
Tribological Properties ◽  
Liquid Films

Nanometer-Thick Fluorinated Ionic Liquid Films as Lubricants in Data-Storage Devices

2019 ◽  
Vol 2 (8) ◽  
pp. 5260-5265 ◽  
Author(s):  
Bingchen Wang ◽  
Catherine Moran ◽  
Darren Lin ◽  
Huan Tang ◽  
Edward Gage ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Data Storage ◽  
Liquid Films ◽  
Storage Devices

Ionic Liquid Thin Films: Potential Solution to Lubricate Miniaturized Devices

2005 ◽  
Author(s):  
Qunji Xue ◽  
Bo Yu ◽  
Feng Zhou ◽  
Ping Gao ◽  
Yongmin Liang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Films ◽  
Friction Reduction ◽  
Chemical Characteristics ◽  
Potential Solution ◽  
X Ray ◽  
Substrate Surfaces ◽  
Vinyl Group ◽  
Scanning Electron ◽  
Miniaturized Devices

The tribological properties of ultra-thin ionic liquid films (IL films) were evaluated using a Universal Micro-tribometer-2MT tester. The morphologies of the wear tracks of the films and the counterpart surfaces were examined using a JEM-1200EX scanning electron microscope (SEM) equipped with a Kevex energy dispersive X-ray analyzer (EDXA) attachment. It was found that the tribological performances of IL films were closely related to the chemical characteristics of the substrate surfaces. The films of vinyl group functionalized ionic liquids on hydroxylated substrate and vinyl group modified substrate exhibited very good friction-reduction and wear-resistant properties. IL films can be a potential solution to the lubrication of miniaturized devices.

Dynamical Response of the Electric Double Layer Structure of the DEME-TFSI Ionic Liquid to Potential Changes Observed by Time-Resolved X-ray Reflectivity

2016 ◽  
Vol 230 (4) ◽  
Author(s):  
Wolfgang Voegeli ◽  
Etsuo Arakawa ◽  
Tadashi Matsushita ◽  
Osami Sakata ◽  
Yusuke Wakabayashi
Keyword(s):  
Ionic Liquid ◽  
Double Layer ◽  
Time Scale ◽  
Electric Double Layer ◽  
Structural Changes ◽  
Layer Structure ◽  
Dynamical Response ◽  
Relaxation Processes ◽  
Time Resolved ◽  
X Ray

AbstractThe interface between the N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide (DEME-TFSI) ionic liquid and a gold (111) surface was investigated with time-resolved X-ray reflectivity in order to clarify the dynamics of structural changes of the electric double layer after changing the electrode potential. In the experiment, the potential was switched repeatedly between +1.5 V and −1.5 V every 2 s or every 0.3 s, while measuring the specular X-ray reflectivity. When the potential was switched every 2 s, the time dependence of the reflectivity was different from that of the accumulated charge. This indicates structural relaxation processes that occur on a slower time scale than the acummulation of the charge at the electric double layer.When the potential was switched every 0.3 s, on the other hand, the reflectivity changes followed the evolution of the charge of the electric double layer within the experimental precision, indicating that slow relaxation processes without charge transfer do not contribute significantly to structural changes at this time scale.

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